Piper Laurie (the mother in the horror film Carrie) appears here as the mother of a deranged deaf-mute girl. The mom runs a drive-in theater which shows mostly horror films. The girl is deranged because she is possessed by the spirit of her long-dead dad, a gangster who was gunned down by the mob. The vengeful spirit uses his daughter to gain vengeance on his assassins, many of whom now work at the drive-in. One by one the mobsters bite the dust as the demonized little girl extracts revenge for her deceased daddy.